Make HasRepresentation() work better for vector images.

ui/gfx/paint_vector_icon.cc

Index: ui/gfx/paint_vector_icon.cc
diff --git a/ui/gfx/paint_vector_icon.cc b/ui/gfx/paint_vector_icon.cc
index 7121fde314d5a6933fd93de8c7773f26c82ceac3..6091897f811fc773251f92deea66959cd3b0014f 100644
--- a/ui/gfx/paint_vector_icon.cc
+++ b/ui/gfx/paint_vector_icon.cc
@@ -309,6 +309,10 @@ class VectorIconSource : public CanvasImageSource {
   ~VectorIconSource() override {}
 
   // CanvasImageSource:
+  bool HasRepresentationAtAllScales() const override {
+    return id_ != VectorIconId::VECTOR_ICON_NONE;
+  }
+
   void Draw(gfx::Canvas* canvas) override {
     if (path_.empty()) {
       PaintVectorIcon(canvas, id_, size_.width(), color_);